The stage-select menu now displays the music titles as well. The default Hakurei Shrine BGM is
"Seven-Orb Collection Showdown" (七玉蒐集ショウダウン), and the default Kourindou BGM is
"Occult ? la Carte" (オカルトアラカルト). Both are by Akiyama Uni.
Kasen's first new spell card, "Prosthetic Arm Proteus", is a grab move that emits a tornado of bandages diagonally down. Should the opponent get caught in them, Kasen flings them across the screen. Her second card, "Hawk Beacon", creates a rainbow beacon like the ones from her charged projectile attack. With this powered-up beacon on screen, her up special (firing Kanda at any beacons present) will create an additional explosion of bullets. The powered-up beacon will remain on screen until it's been used four times.
edit: Video of the new cards:
http://www.nicovideo.jp/watch/sm26173688She also has a new neutral special move that summons Manzairaku, the giant seal from WaHH chapter 22. He(?) bounces a beach ball off his nose; if you perform the move again before the ball falls, he can bounce it multiple times across the screen.